Help! I am not new to this game. I've owned four Shelties. I know they bark at anything that moves, but my current Sheltie is attempting to chase cars and its dangerous. First - I live in a townhouse with a small yard. Therefore, she must be walked. I never ever walk her without a lead. Second - She will attempt to take off if she sees a car, truck, bicycle, scooter, stroller, wheel barrow, lawnmower, or vacuum. In other words, if it moves she is going after it. I've done everything trying to get her to stop. If she hears a motor, or sees wheels turning, she perks up, starts pulling on the lead, frantically barking and immediately tries to charge. Its dangerous. If she ever got away from me, she could get run over. I choke up on the lead, and tell her no cars with little to no effect. She is very food motivated, and I've tried rewarding her with treats. The treats work for the moment and the next time we are outside, she is back in charge mode. I've had people tell me to do everything from shock collar, spray water bottle, and shake a can of coins. I need feedback from the Sheltie family. Can you give some advice on what you think would be the best method to get her stop the negative behavior? I would like to be able to use the behavior modification training with other behaviors that are problematic, but necessarily dangerous.